This data set contains data and files belonging to the publication Hongwei Li, Dmitry Tolmachev, Piotr Batys, Maria Sammalkorpi and Jodie L. Lutkenhaus, "Solvent-responsive glass transition behavior of polyelectrolyte complex", Macromolecules (2025). https://doi.org/10.1021/acs.macromol.4c02417 Please cite the above publication when using this data set or the simulation files. This work is supported by the National Science Foundation under Grant No. 1905732, Academy of Finland through its Centres of Excellence Programme (2022-2029, LIBER) under project nos. 346111 (M.S.) and 364205 (M.S.), Academy of Finland project no. 359180 (M.S) and Novo Nordisk Foundation under project no. NNF22OC0074060 (M.S.). We are grateful for the support by the FinnCERES Materials Bioeconomy Ecosystem. Computational resources by the CSC IT Centre for Science, Finland, RAMI – RawMatTERS Finland Infrastructure, and Poland’s high-performance computing infrastructure PLGrid (HPC Centers: ACK Cyfronet AGH), grant no. PLG/2023/016884, are also gratefully acknowledged.

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